GB1173772A - Improvements in or relating to Vibration Responsive Apparatus - Google Patents

Improvements in or relating to Vibration Responsive Apparatus

Info

Publication number
GB1173772A
GB1173772A GB6902/66A GB690266A GB1173772A GB 1173772 A GB1173772 A GB 1173772A GB 6902/66 A GB6902/66 A GB 6902/66A GB 690266 A GB690266 A GB 690266A GB 1173772 A GB1173772 A GB 1173772A
Authority
GB
United Kingdom
Prior art keywords
frequency
mirror
vibrating
vibrations
laser
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB6902/66A
Inventor
David Anthony Neish
Stephen Charles Laud Botcherby
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Decca Ltd
Original Assignee
Decca Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL133616D priority Critical patent/NL133616C/xx
Application filed by Decca Ltd filed Critical Decca Ltd
Priority to GB6902/66A priority patent/GB1173772A/en
Priority to US615683A priority patent/US3482436A/en
Priority to SE02042/67A priority patent/SE331493B/xx
Priority to BE694087D priority patent/BE694087A/xx
Priority to DE1623410A priority patent/DE1623410B2/en
Priority to NL6702275A priority patent/NL6702275A/xx
Publication of GB1173772A publication Critical patent/GB1173772A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/50—Systems of measurement based on relative movement of target
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
    • G02F2/002—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light using optical mixing

Abstract

1,173,772. Optical detection of movement; light modulators. DECCA Ltd. 3 Feb., 1967 [16 Feb., 1966], No. 6902/66. Headings H4D and H4F. [Also in Divisions G1, G2 and H1] The characteristics of vibrations, such as of a machine or a distant window vibrated by speech within a room, are determined by comparing a laser beam, Doppler shifted by the vibrations, with a second beam derived from the same laser, the second beam being shifted in frequency, or alternatively the first beam being further shifted in frequency, by an amount greater than the Doppler shift introduced by the vibrating element, vibratory movement towards and away from the laser can thereby be distinguished. In the embodiment a laser beam is split into two orthogonally polarized beams by prisms 14 having a polarizing dielectric interface. One beam is directed by a telescope 17 to a vibrating element 10 of interest and the second, a reference beam to a mirror 16 vibrating at a frequency much higher than the element 10. Both beams are returned and combined at prisms 14 and are directed via a half-wave plate 19 and a second beam splitter 20 on to photo-electric detectors 21 and 22. The outputs of the detectors are passed to a differential amplifier, whose output comprises a signal representative of the vibrations of the element 10 and modulated at the frequency of the mirror 16. Demodulation occurs at 24 and a receiver such as a loud-speaker or audio recorder indicates the vibrations of the element 10. If the frequency of the vibrating mirror is low, but the speed of the mirror high enough to sufficiently shift the second beam, synchronous switching of the amplifier output is necessary. Instead of a vibrating mirror 16 a Kerr cell or Pockel's effect modulator could be used.
GB6902/66A 1966-02-16 1966-02-16 Improvements in or relating to Vibration Responsive Apparatus Expired GB1173772A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL133616D NL133616C (en) 1966-02-16
GB6902/66A GB1173772A (en) 1966-02-16 1966-02-16 Improvements in or relating to Vibration Responsive Apparatus
US615683A US3482436A (en) 1966-02-16 1967-02-13 Vibration responsive apparatus
SE02042/67A SE331493B (en) 1966-02-16 1967-02-14
BE694087D BE694087A (en) 1966-02-16 1967-02-15
DE1623410A DE1623410B2 (en) 1966-02-16 1967-02-15 Method and arrangement for measuring mechanical movements of an object
NL6702275A NL6702275A (en) 1966-02-16 1967-02-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6902/66A GB1173772A (en) 1966-02-16 1966-02-16 Improvements in or relating to Vibration Responsive Apparatus

Publications (1)

Publication Number Publication Date
GB1173772A true GB1173772A (en) 1969-12-10

Family

ID=9822917

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6902/66A Expired GB1173772A (en) 1966-02-16 1966-02-16 Improvements in or relating to Vibration Responsive Apparatus

Country Status (6)

Country Link
US (1) US3482436A (en)
BE (1) BE694087A (en)
DE (1) DE1623410B2 (en)
GB (1) GB1173772A (en)
NL (2) NL6702275A (en)
SE (1) SE331493B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556841A1 (en) * 1983-12-14 1985-06-21 Onera (Off Nat Aerospatiale) Method and device for Doppler laser velocimetry with homodyne detection
GB2170321A (en) * 1985-01-22 1986-07-30 Hoya Corp Optical frequency shifter for heterodyne measurement
FR2641872A1 (en) * 1989-01-18 1990-07-20 Clausin Jacques System for locating helicopters hidden behind a screen of vegetation
GB2243968A (en) * 1990-01-12 1991-11-13 Shell Int Research Remote seismic sensing
US5289434A (en) * 1992-09-18 1994-02-22 Shell Oil Company Retroreflector apparatus for remote seismic sensing
US5317383A (en) * 1992-09-18 1994-05-31 Shell Oil Company Array retroreflector apparatus for remote seismic sensing
US5327216A (en) * 1992-09-18 1994-07-05 Shell Oil Company Apparatus for remote seismic sensing of array signals using side-by-side retroreflectors

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5632569B2 (en) * 1973-08-17 1981-07-29
US3879988A (en) * 1973-12-19 1975-04-29 Gen Electric Optical comparator for measuring vibration on a rotating object
GB1513249A (en) * 1974-09-03 1978-06-07 Decca Ltd Remote movement detector
GB1513882A (en) * 1975-05-30 1978-06-14 Decca Ltd Optical detecting system
US4180328A (en) * 1976-07-06 1979-12-25 United Kingdom Atomic Energy Authority Interferometer which corrects for spurious vibrations
US4170397A (en) * 1976-12-16 1979-10-09 Decca Limited Vibratile optical boresight
CH668488A5 (en) * 1985-06-12 1988-12-30 Kern & Co Ag ELECTROOPTIC DISTANCE MEASURING DEVICE.
US4751382A (en) * 1986-09-23 1988-06-14 Reiton, Limited Laser sensor with encoded laser output signal
DE3807004A1 (en) * 1987-03-02 1988-09-15 Olympus Optical Co ULTRASONIC TREATMENT DEVICE
DE3842061A1 (en) * 1988-12-14 1990-06-21 Manfred Band Method for the determination of mechanical defects in brittle material moulded parts, especially ceramic substrate plates
US5520052A (en) * 1994-02-10 1996-05-28 The United States Of America As Represented By The United States Department Of Energy Method and apparatus for determining material structural integrity
DE19801959A1 (en) * 1998-01-21 1999-07-22 Polytec Gmbh Optical construction for non-contact vibration measurement
CN101556185B (en) * 2009-04-15 2011-01-26 中国科学院上海光学精密机械研究所 Double frequency shift laser doppler vibration measuring device
US10222253B2 (en) * 2015-07-14 2019-03-05 Lawrence Livermore National Security, Llc UV laser based stand-off acoustic sensor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3360987A (en) * 1964-07-03 1968-01-02 Gen Precision Inc Optical radar system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556841A1 (en) * 1983-12-14 1985-06-21 Onera (Off Nat Aerospatiale) Method and device for Doppler laser velocimetry with homodyne detection
GB2170321A (en) * 1985-01-22 1986-07-30 Hoya Corp Optical frequency shifter for heterodyne measurement
FR2641872A1 (en) * 1989-01-18 1990-07-20 Clausin Jacques System for locating helicopters hidden behind a screen of vegetation
GB2243968A (en) * 1990-01-12 1991-11-13 Shell Int Research Remote seismic sensing
US5289434A (en) * 1992-09-18 1994-02-22 Shell Oil Company Retroreflector apparatus for remote seismic sensing
US5317383A (en) * 1992-09-18 1994-05-31 Shell Oil Company Array retroreflector apparatus for remote seismic sensing
US5327216A (en) * 1992-09-18 1994-07-05 Shell Oil Company Apparatus for remote seismic sensing of array signals using side-by-side retroreflectors

Also Published As

Publication number Publication date
DE1623410C3 (en) 1974-09-19
DE1623410B2 (en) 1974-02-14
NL6702275A (en) 1967-08-17
BE694087A (en) 1967-07-17
SE331493B (en) 1971-01-04
DE1623410A1 (en) 1971-03-25
NL133616C (en)
US3482436A (en) 1969-12-09

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE Patent expired